PSRK Method for Gas Hydrate Equilibria: I. Simple and Mixed Hydrates

Ji Ho Yoon, Yoshitaka Yamamoto, Takeshi Komai, Taro Kawamura

研究成果: Article査読

33 被引用数 (Scopus)

抄録

A thermodynamic model using the predictive Soave-Redlich-Kwong (PSRK) group contribution method to calculate the fugacities of all components in the vapor and liquid phases in equilibrium with the coexisting hydrate phase is proposed. Since the PSRK method together with the UNIFAC model takes the gas-gas interaction in the vapor and liquid phases into account, the phase equilibria of mixed gas hydrates can be successfully reproduced. This approach greatly improves upon the accuracy of the modified Huron-Vidal second-order (MHV2) model, especially for three-guest hydrate systems. Based on experimentally determined X-ray data, an accurate representation for the molar volume of the structure I (sI) hydrate is provided and used for predicting the equilibrium dissociation of methane hydrate at high pressures. Using this correlation, it is possible to reduce noticeable errors in dissociation predictions of high-pressure hydrate formers. Complete phase behavior, including a new quadruple point, which is predicted to be 272.6 K and 7.55 MPa, for cyclopropane hydrate, is presented by the proposed model calculation.

本文言語English
ページ(範囲)203-214
ページ数12
ジャーナルAIChE Journal
50
1
DOI
出版ステータスPublished - 2004 1月
外部発表はい

ASJC Scopus subject areas

  • バイオテクノロジー
  • 環境工学
  • 化学工学(全般)

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